Content      ..     1      2      3      4      ..

Siemens SITRANS P. Operating Instructions (2019) - page 3

Operating

7.2 Operating the device with display

7.2.3.2

Navigating in the parameter view

Requirement

The button lock is disabled.

Disabling button lock (Page 135)

Procedure

1. Use the

or

buttons to navigate within the parameters.

To navigate faster, keep the

or

button pressed.

After the last parameter, you jump to the first parameter, and vice versa.

2. To switch to edit view, press the

button.

3. To return to the measurement view, press the

button.

7.2.4

Edit view

You change the parameter values in the edit view. Wizards are available for specific

parameters.

Parameter values

There are various parameter values:

● Enumerations (e.g. unit)

● Numerical values (e.g. damping)

① Name of parameter and, if availa-

④ "EDIT" symbol (flashing)

ble, unit (alternating)

② Enumeration arrows (for enumera- ⑤ Parameter value

tions only)

③ Parameter ID

Figure 7-4

Example of edit view

For parameters with an associated unit, the parameter name and unit are displayed as

alternating values in ①. Example: Lower range value in mA.

SITRANS P320/P420 with 4 to 20 mA/HART

80

Operating

7.3 Remote operation

7.2.4.1

Changing parameter values

Requirement

The button lock is disabled.

Disabling button lock (Page 135)

Procedure

1. Navigate to the parameter view (Page 76).

2. Select the desired parameter with the

or

button.

Use the button to confirm.

You are in the edit view.

3. Change the parameter value with the

or

button.

To navigate faster, keep the

or

button pressed.

4. Save the change with the

button.

Or, cancel the change with the

button.

7.2.5

Symbols for information messages

The following symbols are shown on the display.

Display symbol

Description

EDIT

● 'EDIT' is permanently enabled in the parameter view. You can read the

parameter.

● 'EDIT' flashes in the edit view. You can change the parameter.

L

Device is write-protected by a jumper.

LL

Button lock of device is enabled

LP

Parameters and device functions are write-protected with a user PIN.

SIL

Functional Safety is enabled

Co

The output current is constant (e.g. for loop test).

INFO

The ID next to the INFO symbol is used for identification of the diagnostic message.

7.3

Remote operation

You can operate the device using HART communication. The following is required for this

purpose:

● A handheld (e.g. FC475) or PC software such as SIMATIC PDM.

● A HART modem to connect a PC with the device or a lead to connect the handheld with the

device.

SITRANS P320/P420 with 4 to 20 mA/HART

81

Operating

7.4 Locking the device

7.4

Locking the device

The following options are available to lock the device:

● Enabling write protection using the jumper. (Page 82)

● Enabling write protection using the user PIN. (Page 138)

● Enabling write protection using the button lock. (Page 134)

Write protection

Sym-

ID

Read measured values on

Read parameters on the

Change parameters

bol

the display

display

via the device with dis-

play

Jumper set

L

Yes

No

No

User PIN¹⁾ enabled

LP

Yes

Yes

Yes, after input of the

user PIN

Button lock enabled

LL

Yes

No

No

¹⁾The user PIN is factory set to 2457 in the device. When delivered, write protection is disabled

using the user PIN.

Devices with functional safety

To enable functional safety, you first enable the user PIN.

7.4.1

Enable write protection with jumper

The jumper is used for enabling write protection.

When write protection is enabled with the jumper:

● Measured values are read-only.

● The display changes automatically between the measured values.

● Operation via the buttons is disabled.

Procedure

1. De-energize the device.

2. Use a 3 mm Allen key to loosen the front safety catch.

3. Remove the front cover connector of the device.

SITRANS P320/P420 with 4 to 20 mA/HART

82

Operating

7.4 Locking the device

4. Remove the display from the holder.

5. Disconnect the cable of the display from the 4-pole connector ①.

1

Write protection is disabled (e.g. as factory set-

Write protection is enabled

ting)

7.4.2

Enable user PIN

Requirement

The User PIN is disabled.

SITRANS P320/P420 with 4 to 20 mA/HART

83

Operating

7.4 Locking the device

Procedure

1. Navigate to the parameter view.

Navigating in the views (Page 76)

2. Select the parameter "User PIN".

3. Use the

button to confirm.

The message "USER PIN ON" (User PIN enabled) appears for 2 seconds.

Result

The User PIN is activated after about 10 minutes or after a device restart.

7.4.3

Enabling button lock

Procedure

1. Navigate into the parameter view.

Navigating in the views (Page 76)

2. In the parameter view, select the "Button lock" parameter.

3. Press the

button.

The "EDIT" symbol flashes.

4. Select ON with the

or

button.

5. Use the

button to confirm.

Result

● The display automatically returns to the measurement view.

● The display automatically changes between the measured values every 12 seconds.

● The symbol for button lock "LL" and the measured value ID are displayed alternately.

SITRANS P320/P420 with 4 to 20 mA/HART

84

Operating

7.4 Locking the device

Note

For a device without display, you activate the button lock using remote operation.

SITRANS P320/P420 with 4 to 20 mA/HART

85

Commissioning

8

8.1

Basic safety instructions

DANGER

Toxic gases and liquids

Danger of poisoning when venting the device: if toxic process media are measured, toxic

gases and liquids can be released.

● Before venting ensure that there are no toxic gases or liquids in the device, or take the

appropriate safety measures.

WARNING

Improper commissioning in hazardous areas

Device failure or risk of explosion in hazardous areas.

● Do not commission the device until it has been mounted completely and connected in

accordance with the information in Technical data (Page 199).

● Before commissioning take the effect on other devices in the system into account.

WARNING

Commissioning and operation with pending error

If an error message appears, correct operation in the process is no longer guaranteed.

● Check the gravity of the error.

● Correct the error.

● If the error still exists:

- Take the device out of operation.

- Prevent renewed commissioning.

WARNING

Loss of explosion protection

Risk of explosion in hazardous areas if the device is open or not properly closed.

● Close the device as described in Connecting (Page 65).

SITRANS P320/P420 with 4 to 20 mA/HART

87

Commissioning

8.4 Commissioning the device with display

4. Open the cover of the buttons:

Figure 8-1

Top view

5. Operate the buttons as follows:

Apply lower range value (with pressure applied)

Hold down the button

for 3 seconds.

Apply upper range value (with pressure applied)

Hold down the button

for 3 seconds.

Zero point adjustment

Hold down the buttons

and for 3 seconds.

Set Upper fault current

Hold down the button

for 3 seconds.

Set Lower fault current

Hold down the button

for 3 seconds.

Further functions are available via remote operation (e.g. SIMATIC PDM).

8.4

Commissioning the device with display

Introduction

In this section, you will learn how to commission the device step-by-step.

Before you start, please read the following safety information:

● General safety information (Page 19)

● Basic safety information: Installing/mounting (Page 43)

● Basic safety information: Connecting (Page 65)

● Basic safety information: Commissioning (Page 87)

Read the entire device manual in order to achieve the optimum performance of the device.

SITRANS P320/P420 with 4 to 20 mA/HART

90

Commissioning

8.4 Commissioning the device with display

Procedure

1. Mount the device.

Installing

(Page 47)

Installation (level) (Page 51)

2. Connect the device.

Connecting the device (Page 68)

3. Switch on the supply voltage.

Switching on the supply voltage (Page 88)

4. Open the cover of the buttons:

Figure 8-2

Top view

5. Set the measuring range.

Set lower range value/upper range value (without pressure available) (Page 109)

Apply lower range value/upper range value (with pressure present) (Page 122)

6. Set the pressure unit.

Pressure units [01] (Page 106)

7. Set the application of your device.

Application [05] (Page 110)

8. Set the scaling points.

Lower scaling point [18] (Page 130)

Upper scaling point [19] (Page 132)

9. Set the zero point.

Adjusting zero point (gauge pressure) (Page 120)

Adjusting the zero point (differential pressure) (Page 121)

Adjusting zero point (absolute pressure) (Page 121)

10.Lock the device.

Locking the device (Page 82)

11.Enable Functional Safety (for devices with Functional Safety).

Enabling Functional Safety over device with display (Page 167)

You can find additional functions in the section Parameter assignment (Page 101)

SITRANS P320/P420 with 4 to 20 mA/HART

91

Commissioning

8.5 Application examples

8.5

Application examples

8.5.1

Gauge pressure, absolute pressure from differential pressure series, and

absolute pressure from gauge pressure series

8.5.1.1

Commissioning in gaseous environments

Requirement

All valves are closed.

Procedure

$

%

A Pressure transmitter above the pressure

B Pressure transmitter below the pressure

sampling point

sampling point

① Pressure transmitter

⑥ Shut-off valve

② Shut-off valve

⑦ Shut-off valve (optional)

③ Shut-off valve to process

⑧ Condensate vessel (optional)

④ Shut-off valve for test connection

⑨ Blowout valve

or for bleed screw

⑤ Pressure line

SITRANS P320/P420 with 4 to 20 mA/HART

92

Commissioning

8.5 Application examples

1. Open the shut-off valve for the test connection

④.

2. Via the test connection of the shutoff valve ②, apply the pressure corresponding to the

lower range value to the pressure transmitter.

3. Ensure that the lower range value corresponds to the desired value. Otherwise, correct the

value.

4. Close the shut-off valve for the test connection ④.

5. Open the shut-off valve ⑥ at the pressure tapping point.

6. Open the shut-off valve for the process ③.

8.5.1.2

Commissioning with steam or liquid

Requirement

All valves are closed.

Procedure

① Pressure transmitter

② Shut-off valve

③ Shut-off valve to process

④ Shut-off valve for test connection or for bleed screw

⑤ Pressure line

⑥ Shut-off valve

⑦ Drain valve

⑧ Compensation vessel (steam only)

SITRANS P320/P420 with 4 to 20 mA/HART

93

Commissioning

8.5 Application examples

Procedure

$

%

A

Pressure transmitter above the differential B

Pressure transmitter below the differential

pressure transducer

pressure transducer

① Pressure transmitter

⑦ Blowout valves

② Stabilizing valve

⑧ Condensate vessels (optional)

③, Differential pressure valves

⑨ Differential pressure transducer (e.g.

④

FPS200 and FPS300)

⑤ Differential pressure lines

⑩

3-way valve manifold

⑥ Shut-off valves

1. Open both the shut-off valves ⑥ at the pressure tapping point.

2. Open the stabilizing valve ②.

3. Open the differential pressure valve (③ or ④).

4. Check and, if necessary, correct the zero point when the lower range value is 0 bar (4 mA).

5. Close the stabilizing valve ②.

6. Open the other differential pressure valve (③ or ④).

SITRANS P320/P420 with 4 to 20 mA/HART

95

Commissioning

8.5 Application examples

Procedure

$

%

A

Pressure transmitter below the differential pres- B

Pressure transmitter above the differential pres-

sure transducer

sure transducer

①

Pressure transmitter

⑦ Drain valves

②

Stabilizing valve

⑧ Gas collector vessels (optional)

③, ④

Differential pressure valves

⑨ Differential pressure transducer

⑤

Differential pressure lines

⑩ Vent valves

⑥

Shut-off valves

⑪

5-way valve manifold

1. Open both the shut-off valves ⑥ at the pressure tapping point.

2. Open the stabilizing valve ②.

3. With pressure transmitters below the differential pressure transducer, partially open both

drain valves ⑦ one after the other until liquid emerges without bubbles.

In the case of a pressure transmitter above the differential pressure transducer, partially

open both vent valves ⑩ one after the other until liquid emerges without bubbles.

4. Close both drain valves ⑦ or vent valves ⑩.

5. Partially open the differential pressure valve ③ and the vent valve (sealing plug with vent

valve) on the positive side of the pressure transmitter until liquid escapes without bubbles.

6. Close the vent valve (sealing plug with vent valve).

7. Partially open the vent valve (sealing plug with vent valve) on the negative side of the

pressure transmitter until liquid escapes without bubbles.

8. Close the differential pressure valve ③.

SITRANS P320/P420 with 4 to 20 mA/HART

97

Commissioning

8.5 Application examples

Procedure

① Pressure transmitter

⑦ Drain valves

② Stabilizing valve

⑧ Condensate pots

③, Differential pressure valves

⑨ Differential pressure transducer

④

⑤ Differential pressure lines

⑩ Insulation

⑥ Shut-off valves

⑪ 3-way valve manifold

1. Open both the shut-off valves ⑥ at the pressure tapping point.

2. Open the stabilizing valve ②.

3. Wait until the steam in the differential pressure lines ⑤ and in the equalizing vessels ⑧ has

condensed.

4. Partially open the differential pressure valve ③ and the vent valve (sealing plug with vent

valve) on the positive side of the pressure transmitter until condensate escapes without

bubbles.

5. Close the vent valve (sealing plug with vent valve).

6. Partially open the vent valve (sealing plug with vent valve) on the negative side of the

pressure transmitter until condensate escapes without bubbles.

7. Close the differential pressure valve ③.

8. Partially open the differential pressure valve ④ until condensate escapes without bubbles.

9. Close the vent valve with blanking plug on the negative side ①.

10.Close the differential pressure valve.

11.Open the differential pressure valve ③ by half a revolution.

SITRANS P320/P420 with 4 to 20 mA/HART

99

Parameter assignment

9

9.1

Overview of parameters and functions

Introduction

You can operate the device via local operation or remote operation (e.g. HART communicator,

SIMATIC PDM).

● The parameters that you can reach over the device with a display are marked by the

parameter ID. Hereinafter, the parameter ID is always written inside parentheses after the

parameter name. Example: Parameter "Damping value" [04].

● You can access the complete number of parameters via remote operation.

The device-specific parameters are available in each tool for configuration.

The instructions or online help for these tools will provide you with information on how to use

the different tools for parameter assignment.

List of parameters and functions

The following parameters are available via the local operation and via remote operation (e.g.

SIMATIC PDM).

The parameters are grouped according to their function in the following overview:

Quick start

SIMATIC PDM

Device with display (lo-

Device without display

cal operation)

(local operation)

Quick start wizard

Menu command "De-

-

-

vice > Wizard - Quick

start..."

Current output

SIMATIC PDM

Device with display (lo-

Device without display

cal operation)

(local operation)

Apply lower range value (with pressure applied)

Menu command "De-

Apply lower range val-

Commissioning the de-

vice > Apply values"

ue parameter [08]

vice without display

Apply upper range value (with pressure applied)

(Page 122)

(Page 11)

Apply upper range val-

ue parameter [09]

(Page 122)

Set lower range value (without pressure applied)

"Settings > Current out-

Set lower range value

-

put" parameter group

parameter [02]

Set upper range value (without pressure applied)

(Page 108)

Set upper range value

parameter [03]

(Page 108)

Set damping value

"Settings > Current out-

Damping value [04]

-

put" parameter group

(Page 110)

SITRANS P320/P420 with 4 to 20 mA/HART

101

Parameter assignment

9.1 Overview of parameters and functions

Current output

SIMATIC PDM

Device with display (lo-

Device without display

cal operation)

(local operation)

Set fault current

"Settings > Current out-

Select fault current [10]

Commissioning the de-

put" parameter group

(Page 124)

vice without display

(Page 11)

Lower fault current [11]

(Page 124)

Upper fault current [12]

(Page 125)

Set saturation limits

"Settings > Current out-

Lower saturation limit

-

put" parameter group

[13] (Page 125)/Upper

saturation limit [14]

(Page 126)

Digital-to-analog converter trim

Menu command "De-

-

-

vice > DAC trim"

Loop test

Menu command "De-

Loop test [31]

-

vice > Loop test"

(Page 141)

Application

SIMATIC PDM

Device with display (lo-

Device without display

cal operation)

(local operation)

Select pressure units

"Settings > Units" pa-

Display of the pressure

-

rameter group

units (Page 107)

Select the temperature unit for sensor and elec-

"Settings > Sensor

Temperature units [17]

-

tronics temperature

temperature units" pa-

(Page 130)

rameter group

Set additional measuring task (e.g. level, volume

"Settings > Select out-

Application [05]

-

flow, mass flow, volume, set customized charac-

put > Application" pa-

(Page 110)

teristic curve)

rameter group

Set customized characteristic curve

Menu command "De-

-

-

vice > Customized

characteristic curve"

Set scaling points

"Settings > Current out-

Lower scaling point

-

put > Scaling"

[18] (Page 130)/Upper

scaling point [19]

(Page 132)

Select unit of scaled value

"Settings > Current out-

Units [16] (Page 127)

-

put > Scaling > Units"

SITRANS P320/P420 with 4 to 20 mA/HART

102

Parameter assignment

9.1 Overview of parameters and functions

Calibration

SIMATIC PDM

Device with display (lo-

Device without display

cal operation)

(local operation)

Correct the zero point error

Menu command "De-

Zero point adjustment

Commissioning the de-

vice > Zero point ad-

[07] (Page 119)

vice without display

justment"

(Page 11)

Sensor calibration

Menu command "De-

-

-

vice > Sensor calibra-

tion"

Apply lower range value

Menu command "De-

Apply lower range val-

Commissioning the de-

vice > Apply values"

ue parameter [08]

vice without display

Apply upper range value

(Page 122)

(Page 11)

Apply upper range val-

ue parameter [09]

(Page 122)

Simulation

SIMATIC PDM

Device with display (lo-

Device without display

cal operation)

(local operation)

Simulate fixed pressure value / simulate ramp

Menu command "De-

-

-

vice > Simulation >

Process values"

Identification

SIMATIC PDM

Device with display (lo-

Device without display

cal operation)

(local operation)

Read and configure identification data of your

"Identification" param-

-

-

device

eter group

Maintenance and diagnostics

SIMATIC PDM

Device with display (lo-

Device without display

cal operation)

(local operation)

Read diagnostic log

Menu command "De-

-

-

vice > Diagnostic log"

Display of the diagnostics

Menu command "Diag-

Diagnostics and trou-

-

nostics > Diagnostics"

bleshooting (Page 189)

Simulate diagnostics

Menu command "De-

-

-

vice > Simulation > Di-

agnostics"

Limit monitoring and event counter

Menu command "De-

-

-

vice > Limit monitoring

and event counter"

Device maintenance, sensor maintenance, serv-

Menu command "Main-

-

-

ice, calibration

tenance"

Display operating time

Menu command "Diag-

-

-

nostics > Device state

Operating hours counter (Page 158)

> HART status"

SITRANS P320/P420 with 4 to 20 mA/HART

103

Parameter assignment

9.1 Overview of parameters and functions

Maintenance and diagnostics

SIMATIC PDM

Device with display (lo-

Device without display

cal operation)

(local operation)

Set peak values

"Maintenance and di-

-

-

agnostics > Peak val-

Reset peak values

ues" parameter group

Menu command "De-

vice > Reset peak val-

ues"

Configure trend log

Menu command "De-

-

-

vice > Trend log set-

Show trend log

tings"

Menu command "Diag-

nostics > Trend log"

Display number of measuring cells or measuring

Parameter group

-

-

transducer electronics replacement

"Maintenance and di-

agnostics > Audit trail >

HW exchange counter"

HART communication

SIMATIC PDM

Device with display (lo-

Device without display

cal operation)

(local operation)

Configure HART address

Menu command "De-

-

-

vice > Assign address"

Set the loop current value in multidrop mode

"Settings > Current out-

-

-

put > Loop current val-

ue in multidrop mode"

Enable or disable the device identification via

-

Identify the device [34]

-

HART command "Find device"

(Page 143)

Select secondary variable (SV)

"Settings > Select out-

SV selection [15]

-

put > SV selection" pa-

(Page 127)

rameter group

Select tertiary variable (TV)

"Settings > Select out-

-

-

put > TV selection" pa-

rameter group

Select quaternary variable (QV)

"Settings > Select out-

-

-

put > QV selection" pa-

rameter group

Write protection

SIMATIC PDM

Device with display (lo-

Device without display

cal operation)

(local operation)

Enable and disable user PIN

Menu command "De-

User PIN [27]

-

vice > Security"

(Page 138)

Change user PIN

Menu command "De-

Change user PIN [24]

-

vice > Security >

(Page 135)

Change user PIN"

Display Recovery ID

Menu command "De-

Recovery ID [25]

-

vice > Security > PIN

(Page 136)

recovery"

SITRANS P320/P420 with 4 to 20 mA/HART

104

Parameter assignment

9.1 Overview of parameters and functions

Write protection

SIMATIC PDM

Device with display (lo-

Device without display

cal operation)

(local operation)

Restore user PIN

Menu command "De-

PIN recovery [26]

-

vice > Security > PIN

(Page 137)

recovery"

Enable and disable button lock

"Security > Button

Button lock [23]

-

lock" parameter group

(Page 134)

Display

SIMATIC PDM

Device with display (lo-

Device without display

cal operation)

(local operation)

Set pressure reference (absolute, gauge)

"Display > Pressure

Pressure reference

-

reference" parameter

[33] (Page 143)

group

Set start view

"Display > Start view"

Start view [32]

-

parameter group

(Page 142)

Display test

Menu command "De-

Display test [30]

-

vice > Squawk"

(Page 141)

Reset

SIMATIC PDM

Device with display (lo-

Device without display

cal operation)

(local operation)

Device restart

Menu command "De-

-

-

vice > Device restart"

Reset digital-to-analog converter to factory set-

Menu command "De-

Reset DAC trim to the

-

ting

vice > Reset > Restore

factory setting

to factory DAC calibra-

(Page 144)

tion"

Restore ordered configuration

Menu command "De-

Restore ordered con-

-

vice > Reset > Restore

figuration (Page 144)

ordered configuration"

Factory reset

Menu command "De-

Restore factory set-

-

vice > Reset > Factory

tings (Page 144)

reset"

Reset to sensor calibration

Menu command "De-

Reset to sensor cali-

-

vice > Reset > Reset to

bration (Page 144)

sensor calibration"

SITRANS P320/P420 with 4 to 20 mA/HART

105

Parameter assignment

9.2 Parameter assignment over device with display

Functional Safety

The following additional functionality is available for devices with Functional Safety:

Functional Safety

SIMATIC PDM

Device with display (lo-

Device without display

cal operation)

(local operation)

Enable and disable Functional Safety

Menu command "De-

Functional Safety [29]

-

vice > Functional Safe-

(Page 140)

ty"

Set the overload behavior

"Setup > Functional

Overload behavior [36]

-

Safety > Overload be-

(Page 145)

havior" parameter

group

9.2

Parameter assignment over device with display

Introduction

This section describes all parameters that you can reach over the device with a display.

You will find information on operating the device with display in the section Operating the device

with display (Page 76).

You can find the list of available parameters with ID and parameter name in the section List of

parameters on the display (Page 78).

9.2.1

Pressure units [01]

With the "Pressure units" [01] parameter, you select the unit of the "Pressure" (P1) measured

value that is displayed in the measurement view.

You can find a description of the pressure units that you can set in the section Display of the

pressure units (Page 107).

With the "Pressure reference" parameter [33], you adapt the display of the pressure units to

your application, if necessary (absolute pressure or gauge pressure).

Both parameters are available using a local operation or over the remote operation.

Example

Pressure units ① and Pressure reference ② (alternating)

SITRANS P320/P420 with 4 to 20 mA/HART

106

Parameter assignment

9.2 Parameter assignment over device with display

See also

Pressure reference [33] (Page 143)

9.2.1.1

Display of the pressure units

Certain units are displayed differently on the display and over remote operation.

Example: Display of unit "mmH₂O" on the dis-

play

Unit ① in the title bar

Unit ② as enumeration

Setting range:

Display (header line)

Display (enumeration)

Remote operation

mbar

mbar

mbar

bar

bar

bar

Pa

Pa

Pa

KPa

KPa

KPa

MPa

MPa

MPa

PSI

PSI

psi

G/cm2

G/cm2

g/cm²

KG/cm2

KG/c2

kg/cm²

KGF/cm2

KF/c2

kgf/cm²

mmH2O

mmW68

mmH₂O

mH2O(4 °C)

mW4

mH₂O (4 °C)

inH20

inW68

inH₂O

inH2O(4 °C)

inW4

inH₂O (4 °C)

mmHG

mmHG

mmHg

inHG

inHG

inHg

hPa

hPa

hPa

atm

atm

atm

torr

torr

torr

Factory setting:

mbar or as specified in the order

9.2.1.2

Setting the pressure units

Requirement

You know the parameter values for the "Pressure units" parameter. (Page 107)

SITRANS P320/P420 with 4 to 20 mA/HART

107

Parameter assignment

9.2 Parameter assignment over device with display

Procedure

1. Navigate to the parameter view.

Navigating in the views (Page 76)

2. Select the "Pressure units" parameter [01].

3. Press the

button.

4. Select the desired unit with the

or

button.

The pressure measurement is converted to the new pressure unit.

5. Use the

button to confirm.

6. Navigate to the "Pressure reference" parameter [33].

7. Press the

button.

8. Select the specific pressure unit for your application (absolute pressure, gauge pressure,

none) with the

or

button.

Result

● The selected pressure unit and pressure reference are displayed as alternating values in the

measurement view.

● If the converted pressure measurement has more than 5 digits, "#####" appears in the

measurement view: Adjust the unit so that a lower value is displayed, e.g. bar instead of

mbar.

9.2.2

Set lower range value [02]/Set upper range value [03]

9.2.2.1

Set lower range value parameter [02]

Sets the lower range value without applied pressure.

Setting range:

Within the measuring limits

Factory setting:

0 bar, or as specified in order

9.2.2.2

Set upper range value parameter [03]

Sets the upper range value without applied pressure.

Setting range:

Within the measuring limits

Factory setting:

Upper measuring range limit, or as specified in order

SITRANS P320/P420 with 4 to 20 mA/HART

108

Parameter assignment

9.2 Parameter assignment over device with display

9.2.2.3

Set lower range value/upper range value (without pressure available)

Introduction

The lower range value (4 mA) corresponds to 0% of the measuring range. The upper range

value (20 mA) corresponds to 100% of the measuring range.

Without pressure available, you have the following options for assigning the desired pressure

measurements to the lower range value and the upper range value:

Device without display

Device with display

Remote operation

Set lower range value

-

"Lower range value" pa-

Settings > Current out-

rameter [02]

put > Lower range value

Set upper range value

-

"Upper range value" pa-

Settings > Current out-

rameter [03]

put > Upper range value

The minimum permissible measuring span of the measuring cell must not be fallen below. You

can find the minimum permissible measuring span of your measuring cell in the section

Technical data (Page 199)

Requirement

● No pressure is present.

● You have a device with display.

Procedure

1. Navigate to the parameter view.

Navigating in the views (Page 76)

2. In the parameter view, set the "Lower range value" parameter [02].

3. Press the

button.

4. Enter a value within the measuring limits with the

and buttons.

5. Use the

button to confirm.

The lower range value is set. Note that the upper range value does not move automatically.

6. Navigate to the "Set upper range value" parameter [03].

7. Press the

button.

8. Enter a value within the measuring limits with the

and buttons.

9. Use the

button to confirm.

The upper range value is set.

Result

You have set your measuring range.

● If the minimum permissible measuring span is fallen below, the message "FAILD" appears.

SITRANS P320/P420 with 4 to 20 mA/HART

109

Parameter assignment

9.2 Parameter assignment over device with display

9.2.3

Damping value [04]

Sets the damping (filtering) for smoothing of sudden process value variations.

Setting range:

0.01 s ... 100 s, in steps of 0.01 s

Factory setting:

2 s, or as specified in order

The damping influences the reaction time of the device: When you increase the damping value,

the response time of the pressure transmitter to changes in the pressure measurement

increases.

● Reduce the damping value for faster response times. Specify a value that meets the

requirements regarding signal stability and response time.

9.2.3.1

Set damping value

Procedure

1. Navigate to the parameter view.

Navigating in the views (Page 76)

2. Select the "Damping value" parameter.

3. Press the

button.

4. Set the damping with the

and buttons.

5. To set the damping in steps of 0.10 s, press and hold down the buttons.

6. Use the

button to confirm.

Result

You have set the damping value.

9.2.4

Application [05]

You use the "Application" parameter to adjust the device for the following measuring tasks.

● Pressure measurement

● Level measurement

● Volume flow measurement

● Mass flow measurement

● Volume measurement

● Customized characteristic curve (only available via remote operation). (Page 149)

Characteristic curves

The device uses a linear characteristic curve for pressure and level measurements.

SITRANS P320/P420 with 4 to 20 mA/HART

110

Parameter assignment

9.2 Parameter assignment over device with display

For volume and mass flow measurements, the device uses adjustable square root functions.

For volume measurement, the device uses the tank characteristic curves for various vessel

geometries.

In the "Customized characteristic curve" application, enter the breakpoints of the characteristic

curve using remote operation (e.g. SIMATIC PDM).

The set application acts directly on the current output:

3UHVVXUH 39

3URFHVV

'DPSLQJ YDOXH

SUHVVXUH

/RZHU UDQJH YDOXH

8SSHU UDQJH YDOXH

'LVSOD\

+$57

H J OHYHO YROXPH IORZ

$SSOLFDWLRQ

/RZHU XSSHU

RI PHDVXULQJ VSDQ ORRS FXUUHQW

VFDOLQJ SRLQW

Figure 9-1

Flow diagram

You have various options for setting the measuring task of your device:

Device with display

Remote operation

"Application" parameter [05]

Settings > Select output > Application or using the

Quick start wizard

SITRANS P320/P420 with 4 to 20 mA/HART

111

Parameter assignment

9.2 Parameter assignment over device with display

Setting range:

Application

Characteristic curve

Pressure

PRESS

Linear, proportional to pressure

Level

LEVEL

Linear, proportional to level

Volume flow

VSLN

Linear, square root

Proportional to flow rate, linear up

to the application point (Page 119)

VSOFF

Hold at 0, square root

Proportional to flow rate, deactiva-

ted up to the suppression of the re-

sidual flow (Page 132)

VSLN2

Two-step linear - square root

Proportional to flow, two-step linear

up to the application point

VSL2B

Two-step linear, square root (bidir-

ectional)

Volume

CYLIN

Cylinder vessel

SPHER

Sphere vessel

VLIN

Linear vessel

CONIC

Conical bottom vessel

PARAB

Parabolic bottom vessel

HALF

Half sphere bottom vessel

FLAT

Flat sloped bottom vessel

PARAE

Parabolic ends vessel

Mass flow

MSLN

Linear, square root

Proportional to flow rate, linear up

to the application point (Page 119)

MSOFF

Hold at 0, square root

Proportional to flow rate, deactiva-

ted up to the suppression of the re-

sidual flow (Page 132)

MSLN2

Two step linear, square root

Proportional to flow, two-step linear

up to the application point

MSL2B

Two-step linear, square root (bidir-

ectional)

Customized characteris-

CUSTM

Custom

tic curve

Factory setting:

PRESS, or as specified in order

9.2.4.1

Pressure measurement

To set the application of the device for the pressure measurement, select the "linear"

characteristic curve using the "Application" parameter (PRESS).

● The device uses a linear characteristic curve:

SITRANS P320/P420 with 4 to 20 mA/HART

112

Parameter assignment

9.2 Parameter assignment over device with display

3 EDU

● If the device is set for pressure measurement, no other measured variables (e.g. volume

flow) are available.

Example

For the pressure measurement, you set the following values, for example:

Damping value:

2.0 s

Lower range value:

0.0 bar

Upper range value:

5.0 bar

Application:

Pressure: linear (PRESS)

Unit:

bar

Lower scaling point:

-

Upper scaling point:

-

9.2.4.2

Level measurement

To set the application of the device for the level measurement, select the "level" characteristic

curve using the "Application" parameter (LEVEL).

For a level measurement, the device calculates the level height and the hydrostatic pressure.

The geometry of the vessel is not included in the calculation.

● The device uses a linear characteristic curve:

SITRANS P320/P420 with 4 to 20 mA/HART

113

Parameter assignment

9.2 Parameter assignment over device with display

3 EDU

Example

For the level measurement, you set the following values, for example:

Damping value:

2.0 s

Lower range value:

0.0 bar

Upper range value:

5.0 bar

Application:

Level (LEVEL)

Unit:

m

Lower scaling point:

0.0 m

Upper scaling point:

49 m

SITRANS P320/P420 with 4 to 20 mA/HART

114

Parameter assignment

9.2 Parameter assignment over device with display

9.2.4.3

Volume and mass flow measurements

The following characteristic curves are available for volume and mass flow measurements:

● Hold at 0, square root (VSOFF, for volume or MSOFF, for mass flow)

The loop current is 4 mA up to the application point (low flow cut-off (Page 132)). Starting

from the application point, scaling occurs according to the square root:

;

$SSOLFDWLRQ SRLQW

EDU

Y

Loop current or flow

X

Set measuring span

● Linear, square root (VSLN, for volume or MSLN, formass flow)

The loop current has a linear relationship with the differential pressure up to the application

point (Page 119). Starting from the application point, scaling occurs according to the square

root:

;

$SSOLFDWLRQ SRLQW

OLQHDU

EDU

Y

Loop current or flow

X

Set measuring span

SITRANS P320/P420 with 4 to 20 mA/HART

115

Parameter assignment

9.2 Parameter assignment over device with display

● Two step linear, square root (VSLN2, for volume or MSLN2, for mass flow)

The loop current has a proportional relationship with the flow rate, two step linear up to

the application point (Page 119).

The square root SLIN2 has a permanently defined application point of 10%. The range up

to this point contains two linear characteristic curve sections. The first section ranges from

the zero point to 0.6% of the output value and 0.6% of the pressure value. The second

section runs at a steeper slope up to the application point at 10% of the output value and 1%

of the pressure value.

<

; $SSOLFDWLRQ SRLQW

OLQHDU

OLQHDU

;

Y

Loop current or flow

X

Set measuring span

● Two step linear, square root or bidirectional flow measurement (VSL2B, for volume or

MSL2B for mass flow)

For bidirectional flow measurement, enter symmetrical scaling values.

Select a lower scaling value that is symmetrical to the upper scaling value.

Example:

Upper scaling value: 1000 m³/s

Lower scaling value: -1000 m³/s

The output current in the range of 4 to 20 mA is halved in each case for the forward and

reverse measurements.

- The output current of 4 to 12 mA is used for the reverse measurement.

- The output current of 12 to 20 mA is used for the forward measurement.

SITRANS P320/P420 with 4 to 20 mA/HART

116

Parameter assignment

9.2 Parameter assignment over device with display

<

P$

P$

P$

;

Y

Loop current or flow

X

Set measuring span

Example: Volume flow (linear)

For the volume flow measurement, you set the following values, for example:

Damping value:

2.0 s

Lower range value:

0.0 mbar

Upper range value:

0.6 bar

Application:

Linear, square root (VSLN)

Unit:

m³/h

Lower scaling point:

0.0 m³/h

Upper scaling point:

300 m³/h

Example: Mass flow (linear)

For the mass flow measurement, you set the following values, for example:

Damping value:

1 s

Lower range value:

0.0 mbar

Upper range value:

600 mbar

Application:

Linear, square root (MSLN)

Unit:

t/h

Lower scaling point:

0.0 t/h

Upper scaling point:

300 m³/ s

SITRANS P320/P420 with 4 to 20 mA/HART

117

Parameter assignment

9.2 Parameter assignment over device with display

9.2.4.4

Volume measurement

For the volume measurement, the device uses tank characteristic curves for various vessel

shapes.

Display

Vessel

Description

CYLIN

Cylinder vessel

SPHER

Sphere vessel

LINR

Linear vessel

CONIC

Conical bottom vessel

①:Vessel dimension A

PARAB

Parabolic bottom vessel

①:Vessel dimension A

HALF

Half sphere bottom vessel

①:Vessel dimension A

FLAT

Flat sloped bottom vessel

①:Vessel dimension A

PARAE

Parabolic ends vessel

①:Vessel dimension A

②:Vessel dimension L

SITRANS P320/P420 with 4 to 20 mA/HART

118

Content      ..     1      2      3      4      ..